Infection gamemode?

I personally want a Red Rover type game mode. You start with two equal teams, but whenever you are killed by someone on the opposing team you go over to that side. In order not to create overwhelming odds for the losing team, that team would get slightly harder to kill as the number of teammates drops. This could be a fun quick match as one team gets over run and destroyed, or it could draw on forever, each team falling and rising in numbers.